Brazil has a very high import and VAT taxes. My new 2010 Suzuki wee strom (650) cost about $17K USD!!!!!!! I think you owuld be much better off buying a bike and coming in on a tourist visa. Then you can ride out of the country every 6 months or so and come back in for another 6 months. Things may have changed since I was there from 2008 - 2011 but that was common for people wanting to avoid the Brazilian tax.